39 lines
1.1 KiB
Go
39 lines
1.1 KiB
Go
/*
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Copyright 2021 The Karmada Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import "context"
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// ContextForChannel derives a child context from a parent channel.
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//
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// The derived context's Done channel is closed when the returned cancel function
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// is called or when the parent channel is closed, whichever happens first.
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//
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// Note the caller must *always* call the CancelFunc, otherwise resources may be leaked.
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func ContextForChannel(parentCh <-chan struct{}) (context.Context, context.CancelFunc) {
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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select {
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case <-parentCh:
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cancel()
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case <-ctx.Done():
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}
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}()
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return ctx, cancel
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}
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